ZyXEL Communications XGS2210-28 User Manual page 392

Figure 302 Advanced Application > ZULD Status (Stacking mode)
The following table describes the labels in this screen.
Table 172 Advanced Application > ZULD Status
LABEL DESCRIPTION
ZULD is.... This shows whether ZULD is enabled or disabled on the Switch.
Slot (Stacking This field appears only in stacking mode. Click the drop-down list to choose the slot number of
mode) the Switch in a stack.
Port This field displays the port number of the Switch. In stacking mode, the first number is the slot
ID and the second is the port number.
Active This field displays whether ZULD is enabled on the port or not. ZULD must be enabled to detect
an unidirectional link by monitoring OAMPDUs.
Mode This field indicates what ZULD will do when a unidirectional link is detected. In Normal mode,
ZULD only sends a syslog and trap when it detects a unidirectional link. In Aggressive mode,
ZULD shuts down the port (puts it into an ErrDisable state) as well as sends a syslog and trap
when it detects a unidirectional link.
Probe Time Probe time is the length of time that ZULD waits before declaring that a link is unidirectional.
When the probe time expires, and one port (either on the Switch or the connected device)
still has not received an OAMPDU, then ZULD declares that the link is unidirectional.
Link State This field shows the following link states:
• Linkdown: This is an initialization state, where the port is not yet up.
• Probe: This indicates that ZULD is discovering the connected device on this link.
• Bidirectional: Traffic sent by the Switch is received by the connected device on this link,
and traffic from the connected device on this link is received by the Switch.
• Unidirectional: The state of the link between the port and its connected port cannot be
determined either because no ZULD message was received, or one port is not capable of
sending traffic.
• Shutdown: The port has been shut down because its link with the connected device is
unidirectional and ZULD is in Aggressive mode.
Remote Operation This field displays whether ZULD is enabled or disabled on the connected device on this link.
ZULD must be enabled on the connected device and on the port that's connecting to the
Switch.
Chapter 39 ZULD
XGS2210 Series User's Guide
392